2005
80. H. Yan, T. Sato, D. Komago, A. Yamaguchi, K. Oyaizu, M. Yuasa, K. Otake, “Electrochemical Synthesis of a Polypyrrole Thin Film Using Supercritical Carbon Dioxide as a Solvent”, Langmuir,21, 12303-12308 (2005). DOI: 10.1021/la050806i
79. Y. Shiba, D. Yoshii, K. Oyaizu, M. Yuasa, “Water-soluble Poly(phenylene ether) Derivatives as Environmentally Benign and Heat-resistant Coating Materials for Paper”, Kobunshi Ronbunshu,62, 591-597 (2005). DOI: 10.1295/koron.62.591
Functional and environmentally benign water-soluble polymers which have characteristic heat-resistant properties, mechanical strength values, and depolymerization capabilities were designed by introducing ionic groups as side chains to poly(phenylene ether)s.
78. K. Oyaizu, Y. Ohtani, A. Shiozawa, K. Sugawara, T. Saito, M. Yuasa, “Highly Stable Gold(III) Complex with a Hydantoin Ligand in Alkaline Media”, Inorg. Chem., 44, 6915-6917 (2005). DOI: 10.1021/ic050515x
77. M. Yuasa, A. Yamaguchi, H. Itsuki, K. Tanaka, M. Yamamoto, K. Oyaizu, “Modifying Carbon Particles with Polypyrrole for Adsorption of Cobalt Ions as Electrocatatytic Site for Oxygen Reduction”, Chem. Mater., 17, 4278-4281 (2005). DOI: 10.1021/cm050958z
76. A. Yamaguchi, K. Iwaoka, K. Oyaizu, M. Yuasa, “Preparation, Characterization, and Catalytic Properties of Pd Metal Particles Supported on Mesoporous Silicas”, Mater. Technol., 23, 272-278 (2005).
We succeeded in synthesizing the Pd metal particles with various sizes supported on mesoporous silicas by reduction of PdO particles. When as-synthesized Pd/MSs were calcined at 673, 923, and 1073 K, the sizes of the PdO particles were 4.11, 4.95, and 7.79 nm, respectively, as calculated by the results of XRD measurements.
75. Y. Ohtani, T. Saito, K. Sugawara, A. Shiozawa, A. Yamaguchi, K. Oyaizu, M. Yuasa, “Coordination Equilibria of Hydantoin Derivatives with Gold Ions”, J. Sur. Finish. Soc. Jpn., 56, 479-480 (2005). DOI: 10.4139/sfj.56.479
Formation constants of gold complexes containing hydantoin derivatives such as l-methylhydantoin, 5,5-dimethylhydantoin, 1,5,5-trimethylhydantoin, and 5,5-dimethyloxazolidine-2,4-dione were evaluated by analyzing the amount of chloride ions which were emilinated upon coordination of the hydantoin derivatives to a tetrachloroaurate ion.
74. M. Yuasa, A. Yamaguchi, K. Oyaizu, Y. Fujito, M. Kitao, T. Sato, “Cobaltporphyrin-adsorbed Carbon Black: Highly Efficient Electrocatalysts for Oxygen Reduction”, Polym. Adv. Technol., 16, 702-705 (2005). DOI: 10.1002/pat.640
meso-Substituted cobalt porphyrins adsorbed on carbon black were prepared as catalysts for the electroreduction of oxygen.
73. M. Yuasa, K. Oyaizu, Y. Hanyuu, T. Hayashi, A. Yamaguchi, “Synthesis of Hexameric Manganese Porphyrin as an SOD Mimic and SOD Activity”, J. Oleo Sci., 54, 513-518 (2005). DOI: 10.5650/jos.54.513
As models of SOD, manganese porphyrins such as [meso-tetrakis(N-methylpyridinium-4-yl)porphyrinato] manganese(III) was investigated.
72. M. Yuasa, K. Oyaizu, A. Yamaguchi, M. Ishikawa, K. Eguchi, T. Kobayashi, Y. Toyoda, S. Tsutsui, “Structure and Redox Properties of Electropolymerized Film Obtained from Iron meso-Tetrakis(3-thienyl)porphyrin”,Polym. Adv. Technol., 16, 616-621 (2005). DOI: 10.1002/pat.633
Oxidative polymerization of bromoiron(III) meso-tetrakis(3-thienyl)porphyrin gave a novel polymeric porphyrin complex randomly crosslinked at the 2,5-positions of the peripheral thienyl groups.
71. M. Yuasa, K. Oyaizu, Y. Hanyuu, K. Kasahara, A. Yamaguchi, “Novel Functional Nano-size Noniomic Surfactant Particles on Which Cationic Metalloporphyrins Are Absorbed; Preparation, Characterization, and Anti-oxidant Properties”, J. Oleo Sci.,54, 465-471 (2005). DOI: 10.5650/jos.54.465
Cationic manganese(III) 5,10,15,20-tetrakis(N-methylpyridinium-2-yl)porphyrin and manganese(III) 5,10,15,20-tetrakis(N-methylpyridinium-4-yl)porphyrin complexes were synthesized as superoxide dismutase mimics which were introduced into niosomes so as to examine this effects on the capacity of drug delivery system to maintain and perpetuate blood circulation.
70. M. Yuasa, K.Oyaizu, T. Hayashi, A. Yamaguchi, “Synthesis of Polymeric Reconstituted Hemoglobins as Superoxide Dismutase Mimics Designed for Long-term Circulation Maintenance”, J. Oleo Sci., 54, 413-418 (2005). DOI: 10.5650/jos.54.413
A novel reconstituted polymerized hemoglobin containing manganese porphyrins was synthesized. SOD activity of the complex showed that it is a valid SOD model for effectively maintaining and prolonging blood circulation.
69. A. Yamaguchi, M. Yokoyama, T. Ogura, K. Oyaizu, M. Yuasa, T. Ohkubo, H. Sakai, M. Abe, “Novel Approach for the Preparation of Metal Containing Mesoporous Silica Using Solubilization of Fatty Acid Salt”, Chem. Lett., 34, 346-347 (2005). DOI: 10.1246/cl.2005.346
68. M. Yuasa, K. Oyaizu, A. Yamaguchi, M. Ishikawa, K. Eguchi, T. Kobayashi, Y. Toyoda, S. Tsutsui, “Electrochemical Sensor for Superoxide Anion Radical Using Polymeric Iron Porphyrin Complexes Containing Axial 1-Methylimidazole Ligand as Cytochrome cMimics”, Polym. Adv. Technol., 16, 287-292 (2005). DOI: 10.1002/pat.590
A needle-type electrochemical sensor for the facile detection of superoxide anion radical was devised using an electrodeposited film of a polymeric porphyrin complex attached to a carbon microelectrode which was placed in a stainless steel 18G needle tube as an auxiliary electrode.
67. M. Yuasa, K.Oyaizu, A. Ogata, N. Matsukura, A. Yamaguchi, “Preparation of Liposomes Surface-loaded with Cationic Manganese Porphyrins as SOD Mimics”, J. Oleo Sci., 54, 233-239 (2005). DOI: 10.5650/jos.54.233
A water-soluble cationic 5,10,15,20-tetrakis(N-methylpyridinium-4- yl)porphinatomanganese(III) ion and water-insoluble 5,10,15,20-tetrakis(N-3-furyl)porphinatomanganese(III) ion were prepared and ion-complexed with an anionic phospholipid membrane to enhance the circulation persistence of the porphyrin complexes in vivo.
66. A. Yamaguchi, T. Hayashi, K. Oyaizu, M. Yuasa, “Formation of Active Sites for the NO + CO Reaction over Palladium Catalysts Supported on Mesoporous Silica”, Bull. Chem. Soc. Jpn.,78, 192-194 (2005). DOI: 10.1246/bcsj.78.192
65. M. Yuasa, K.Oyaizu, A. Yamaguchi, T. Hayashi, U. Midorikawa, “Surface Modification of Reconstituted Hemoglobins Containing SOD-active Metalloporphyrins”, J. Oleo Sci., 54, 115-123 (2005). DOI: 10.5650/jos.54.115
Reconstituted hemoglobins modified with polyethylene glycol containing iron(III) and manganese(III) complexes of meso-tetra(N-methylpridinium-x-yl)porphyrin (x = 2 and 4) were found to serve as excellent superoxide dismutase mimics under physiological conditions.
2004
64. Y. Ohtani, K. Sugawara, K. Nemoto, A. Shiozawa, A. Yamaguchi, K. Oyaizu, M. Yuasa, “Investigation of Hydantoin Derivatives as Complexing Agent for Gold Plating”, J. Sur. Finish. Soc. Jpn., 55, 933-936 (2004). DOI: 10.4139/sfj.55.933
Hydantoin derivatives were investigated as the complexing agents for gold plating.
63. T. Suga, Y.-J. Pu, K. Oyaizu, H. Nishide, “Electron-transfer Kinetics of Nitroxide Radicals as an Electrode-active Material”, Bull. Chem. Soc. Jpn., 77, 2203-2204 (2004). DOI: 10.1246/bcsj.77.2203
62. M. Yuasa, K. Oyaizu, A. Yamaguchi, M. Kuwakado, “Micellar Cobaltporphyrin Nanorods in Alcohols”, J. Am. Chem. Soc., 126, 11128-11129 (2004). DOI: 10.1021/ja0486216
61. M. Yuasa, K. Oyaizu, A. Horiuchi, A. Ogata, T. Hatsugai, A. Yamaguchi, H. Kawakami, “Liposomal Surface-loading of Water-soluble Cationic Iron(III) Porphyrins as Anticancer Drugs”, Mol. Pharm., 1, 387-389 (2004). DOI: 10.1021/mp049936v
60. B. Shentu, K. Oyaizu, H. Nishide, “Preparation of a Tetraphenylporphyrinatocobalt(II)-poly(3,4-azopyridylene) Complex and Its Oxygen Enrichment Effect at an Oxygen Electrode”, J. Mater. Chem., 14, 3308-3311 (2004). DOI: 10.1039/B405992A
59. K. Oyaizu, T. Mikami, E. Tsuchida, “New p-Conjugated Polyelectrolyte Composed of Alkylphenoxathiinium-type Repeating Units”, Macromolecules,37, 2325-2327 (2004). DOI: 10.1021/ma049849g
58. K. Oyaizu, T. Iwasaki, Y. Tsukahara, E. Tsuchida, “Linear Ladder-type p-Conjugated Polymers Composed of Fused Thiophene Ring Systems”, Macromolecules, 37, 1257-1270 (2004). DOI: 10.1021/ma030520p
57. B. Shentu, K. Oyaizu, H. Nishide, “Electroreduction of Oxygen at a Pt/C-Modified Electrode with a Cobaltporphyrin Complex”, Bull. Chem. Soc. Jpn., 77, 401-405 (2004). DOI: 10.1246/bcsj.77.401
56. E. L. Dewi, K. Oyaizu, H. Nishide, E. Tsuchida, “Electrocatalysis for Dioxygen Reduction by a m-Oxo Decavanadium Complex in Alkaline Medium and Its Application to a Cathode Catalyst in Air Batteries”, J. Power Sources, 130, 286-290 (2004). DOI: 10.1016/j.jpowsour.2003.09.079
The redox behavior of a decavanadium complex [(V=O)10(μ2-O)9(μ3-O)3(C5H7O2)6] was studied using cyclic voltammetry under acidic and basic conditions.
2003
55. K. Oyaizu, E. Tsuchida, “Polythiophenylene Synthesis through Multi-electron Transfer Process”, Macromol. Symp., 204, 19-25 (2003). DOI: 10.1002/masy.200351403
Superacidification of aromatic sulfoxides effects the electrophilic substitution reaction of the resulting hydroxysulfonium ions onto aromatic rings with the elimination of H2O at room temperature. The product, the alkyldiarylsulfonium ion, allows the synthesis of alkylsulfonio-bridged aromatic polymers.
54. K. Oyaizu, E. Tsuchida, “Crystal Structure and Reactivity of a Five-coordinate Chloroiron(III) complex with a Bulky Tetradentate Schiff Base Ligand”, Inorg. Chim. Acta, 355, 414-419 (2003). DOI: 10.1016/S0020-1693(03)00311-6
53. K. Oyaizu, E. Tsuchida, “Oxovanadium(V) Hydroxylate with a Tetradentate Schiff Base Ligand Resulting from Oxidation of Oxovanadium(IV) with O2”, Inorg. Chim. Acta, 353, 332-335 (2003). DOI: 10.1016/S0020-1693(03)00310-4
52. K. Oyaizu, E. Tsuchida, “The First Oxovanadium Ring in [{O=V(salen)}2(μ-F)][VO(salen)][BF4]･(CH2Cl2)xCrystals”, J. Am. Chem. Soc., 125, 5630-5631 (2003). DOI: 10.1021/ja021374q
51. K. Saito, T. Masuyama, K. Oyaizu, H. Nishide, “Depolymerization of Poly(2,6-dimethyl-1,4-phenylene oxide) under Oxidative Conditions”, Chem. Eur. J., 9, 4240-4246 (2003). DOI: 10.1002/chem.200204669
Depolymerization and repolymerization of the engineering plastic poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) was accomplished by using 2,6-dimethylphenol (DMP) under oxidative conditions. When PPO was allowed to react with a sufficient amount of DMP, the molecular weight of the product decreased. The oligomeric product was repolymerized to produce PPO that was essentially identical to the starting material, making the oligomer useful as a reusable resource.
50. K. Oyaizu, R. Matsubara, T. Iwasaki, E. Tsuchida, “Heteropolyacene with Thianthrenium Ring Systems Proving pelectron Delocalization over S Atoms”, J. Macromol. Sci., A40, 655-670 (2003). DOI: 10.1081/MA-120021417
The superacid-induced condensation of o-methylsulfinylated thiophenyl(ene) compounds under dilute conditions induces an intramolecular electrophilic ring-closing reaction of a hydroxysulfonium cation onto the adjacent benzene ring to yield the thianthrenium ring systems, which disclose π electron delocalization over sulfonio linkages demonstrating the efficacy of planarization of the benzene rings for the p-π/d-π interaction in arylsulfonium moieties.
49. E. L. Dewi, K. Oyaizu, H. Nishide, E. Tsuchida, “Cationic Polysulfonium Membrane as Separator in Zinc-air Cell”, J. Power Sources, 115, 149-152 (2003). DOI: 10.1016/S0378-7753(02)00650-X
A polyelectrolyte containing a sulfonium cation, poly(methylsulfonio-1,4-phenylenethio-1,4-phenylene trifluoromethanesulfonate) was tested as a separator in a zinc–air cell.
48. K. Oyaizu, E. L. Dewi, E. Tsuchida, “Coordination of BF4-to Oxovanadium(V) Complexes Evidenced by the Redox Potential of Oxovanadium(IV/V) Couples in CH2Cl2”,Inorg. Chem., 42, 1070-1075 (2003). DOI: 10.1021/ic0205987
47. K. Oyaizu, H. Yonemaru, T. Iwasaki, R. Matsubara, E. Tsuchida, “Convenient Synthesis of Methylsulfonioarylene and Thioarylene Polymers from 1,4-Bis(methylsulfinyl)benzene”, J. Macromol. Sci., A40, 415-423 (2003). DOI: 10.1081/MA-120019068
46. E. L. Dewi, H. Nakano, K. Oyaizu, H. Nishide, E. Tsuchida, “Ion-exchange and Apparent Diffusion Coefficients within Cationic Polysulfonium Coatings Containing Ferricyanide”, J. Macromol. Sci., A40, 37-47 (2003). DOI: 10.1081/MA-120016672
45. E. L. Dewi, K. Oyaizu, E. Tsuchida, “Four-electron Reduction of Dioxygen Catalyzed by a Decavanadium Complex”, Inorg.Chim. Acta, 342, 316-318 (2003). DOI: 10.1016/S0020-1693(02)01158-1
2002
44. K. Oyaizu, H. Nakano, B. Shentu, H. Nishide, “Electroreduction of Oxygen Enriched in a [Poly(ethyleneiminato)]cobalt(II) Layer”, J. Mater. Chem., 12, 3162-3166 (2002). DOI: 10.1039/B205650J
43. B. Shentu, K. Oyaizu, H. Nishide, “Reduction of Oxygen at an Electrode Modified by Cobaltporphyrin Liquid Membrane”, Chem. Lett., 2002, 712-713. DOI: 10.1246/cl.2002.712
42. K. Oyaizu, F. Mitsuhashi, E. Tsuchida, “Palladium-catalyzed Synthesis of Oligo(methylthio)aniline and Conversion to Polyacene-type Electrolytes Bearing Phenothiazinium Repeating Units”, Macromol. Chem. Phys., 203, 1328-1336 (2002). DOI: 10.1002/1521-3935(200207)203:10/11<1328::AID-MACP1328>3.0.CO;2-R
41. K. Oyaizu, T. Mikami, F. Mitsuhashi, E. Tsuchida, “Synthetic Routes to Polyheteroacenes: Characterization of a Heterocyclic Ladder Polymer Containing Phenoxathiin-type Building Blocks”, Macromolecules, 35, 67-78 (2002). DOI: 10.1021/ma010961d
2001
40. K. Oyaizu, Y. Ikai, E. Tsuchida, “A New Synthetic Route to Poly(seleno-1,4-phenylene) from Selenoanisole”, J. Macromol. Sci., A38, 1049-1057 (2001). DOI: 10.1081/MA-100105965
39. K. Oyaizu, E. L. Dewi, E. Tsuchida, “A m-Oxo Diiron(III) Complex with a Short Fe-Fe Distance: Crystal Structure of (m-Oxo)bis[N,N’-o-phenylenebis(salicylideneiminato)iron(III)]”,Inorg. Chim. Acta, 321, 205-208 (2001). DOI: 10.1016/S0020-1693(01)00532-1
38. K. Miyatake, A. Haryono, K. Oyaizu, E. Tsuchida, “Synthesis and Thermal Properties of a Polysulfonium Salt with a Comb-like Structure”, J. Macromol. Sci., A38, 851-859 (2001). DOI: 10.1081/MA-100104452
We report a novel poly(arylenesulfonium salt) bearing n-octadecyl groups as the side chains, which was synthesized via the acid-induced polycondensation of alkyl an aryl sulfoxide.
37. K. Miyatake, K. Oyaizu, E. Tsuchida, A. S. Hay, “Synthesis and Properties of Novel Sulfonated Arylene Ether / Fluorinated Alkane Copolymers”, Macromolecules, 34, 2065-2071 (2001). DOI: 10.1021/ma0019959
The polymerization of 2,3,5,6-tetraphenylhydroquinone (or 2,2‘,3,3‘,5,5‘-hexaphenyl-4,4‘-dihydroxybiphenyl) with α,ω-tetrahydroperfluoroalkanediol and decafluorobiphenyl was carried out to synthesize a series of copolymers.
36. K. Oyaizu, M. Ueno, H. Li, E. Tsuchida, “Copper(II) Complexes Resulting from the Oxygenation of (2,9-Dimethyl-1,10-phenanthroline)copper(I) Chloride in the Presence of Dimethylformamide”, Bull. Chem. Soc. Jpn., 74, 869-870 (2001). DOI: 10.1246/bcsj.74.869
The oxygenation of (2,9-dimethyl-1,10-phenanthroline)copper(I) chloride in THF, followed by a treatment with DMF and acidification with HCl, afforded dichloro[2-(dimethylamino)(hydroxy)methyl-9-methyl-1,10-phenanthroline]copper(II) and (aqua)dichloro(2,9-dimethyl-1,10-phenanthroline)copper(II) quantitatively.
35. K. Miyatake, K. Oyaizu, Y. Nishimura, E. Tsuchida, “Polymerization of Methyl Phenyl Sulfoxide under Acidic Conditions: Synthesis and X-ray Structure Analysis of a Phenylene Sulfonium Polymer”, Macromolecules, 34, 1172-1179 (2001). DOI: 10.1021/ma001811q
Methyl phenyl sulfoxide was found to undergo self-polycondensation in triflic acid in the presence of diphenylamine to produce poly(methylsulfonio-1,4-phenylene triflate).
34. H. Nishide, R. Doi, K. Oyaizu, E. Tsuchida, “Electrochemical and Ferromagnetic Couplings in 4,4’,4’’-(1,3,5-Benzenetryl)tris(phenoxyl) Radical Formation”, J. Org. Chem.,66, 1680-1685 (2001). DOI: 10.1021/jo0013204
33. K. Oyaizu, H. Nakano, J. Natori, E. Tsuchida, “Polysulfonium as a New Electrode-modifying Polyelectrolyte”, J. Electroanal. Chem., 498, 232-236 (2001). DOI: 10.1016/S0022-0728(00)00383-1
32. K. Oyaizu, E. L. Dewi, E. Tsuchida, “Structure and Redox Properties of a Novel Decavanadium Cluster [(V=O)10(μ2-O)9(μ3-O)3(C5H7O2)6] in Dichloromethane”, J. Electroanal. Chem., 498, 136-141 (2001). DOI: 10.1016/S0022-0728(00)00345-4
31. K. Oyaizu, A. Haryono, H. Shinoda, E. Tsuchida, “Oxidative Polymerization of Pyrrole Promoted by Four-electron Transfer to O2: Catalysis of O2-Oxidation by m-Oxo Dinuclear Complexes with Macrocyclic Ligands”, Macromol. Chem. Phys., 202, 1273-1279 (2001). DOI: 10.1002/1521-3935(20010401)202:7<1273::AID-MACP1273>3.0.CO;2-H
